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• W4383498224 endingPage "4906" @default.
• W4383498224 startingPage "4899" @default.
• W4383498224 abstract "The distribution of the spin frequencies of neutron stars in low-mass X-ray binaries exhibits a cut-off at 730 Hz, below the break-up frequency (mass-shedding limit) of neutron stars. The absence of the sub-millisecond pulsars presents a problem, given that these systems are older than the spin-up timescale. We confront models of disc-magnetosphere interaction near torque equilibrium balanced by the torque due to gravitational wave emission. We note that field lines penetrating the disc beyond the inner radius reduce the maximum rotation frequency of the star, a result well-known since the seminal work of Ghosh & Lamb. We show that the polar cap area corresponds to about half the neutron star surface area at the cut-off frequency if the inner radius is slightly smaller than the corotation radius. We then include the change in the moment of inertia of the star due to the accretion of mass and find that this effect further reduces the maximum rotation frequency of the star. Finally, we include the torque due to gravitational wave emission and calculate its contribution to the torque equilibrium. Our results suggest that all three processes are significant at the cut-off frequency, and all of them must be considered in addressing the absence of sub-millisecond pulsars." @default.
• W4383498224 created "2023-07-08" @default.
• W4383498224 creator A5058246979 @default.
• W4383498224 creator A5074479477 @default.
• W4383498224 date "2023-07-07" @default.
• W4383498224 modified "2023-10-14" @default.
• W4383498224 title "On the minimum spin period of accreting pulsars" @default.
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